Abstract
Direct evidence of phase separation in the Co-rich corner of the Co-Cr binary system, the transformation of high-temperature FCC α-Co into a ferromagnetic αf phase and a paramagnetic αp phase, has been experimentally obtained by using diffusion couple technique, scanning electron microscopy with energy dispersion analysis of X-ray (SEM-EDX), analytical transmission electron microscopy, optical microscopy and X-ray diffraction. Thermodynamic calculation, on the basis of the presently obtained phase equilibrium data, has verified that this phase separation arises from magnetic ordering, and that a similar phase separation appears in the HCP phase below 469°C which is transformed into a ferromagnetic εf phase and a paramagnetic εp phase. It is therefore concluded that magnetically induced phase separation must be responsible for the microscopic composition modulation of Cr in the CoCr thin film magnetic recording media.
Original language | English |
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Pages (from-to) | 1-5 |
Number of pages | 5 |
Journal | Journal of Magnetism and Magnetic Materials |
Volume | 234 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2001 Aug |
Keywords
- Co-Cr system
- Magnetic recording media
- Phase separation
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics